Copper plate is coated with silver. Silver is polished to remove all trace of oxide. Then silver is exposed to Iodine vapor. Forms Silver Iodide which is light sensitive. Plate is exposed. Mercury vapor reacts with the unexposed silver to form a silver/mercury amalgam which is 'black'. Then it is sealed under glass to prevent further oxidation/corrosion. Nasty process. Fascinating though.
The images are worth seeing in person. Most antique store 'daguerrotypes' aren't. Real daguerrotypes can be viewed as positives or negatives depending on the angle of the light.
I'm looking forward to attending the Daguerreian Society meeting in Philadelphia this year.
Those of you interested in fiction might want to read THE MERCURY VISIONS of LOUIS DAGUERRE by Dominic Smith...it gives an interesting overview of his life, times and the effects of mercury...
The felting process to make hats involved the hatter chewing the felt when mercury salts were present.
As and aside, there is a "newer" way to develop a daguerrotype plate which does not require Mercury. The plate after exposure is exposed to sunlight behind a red filter ( I think the specific color is very important to the process) and it develops the plate. I can't find the name of the process right now
It's the Becquerel process, if I'm not mistaken.
A bit of photographic trivia: while mercury will not "develop" a silver-gelatin emulsion, mercury vapor will hypersensitize ordinary film. My father was taught this as part of his Army counterintelligence training in the late 1940s. It seems to have involved putting the film (or plate, back then) in a box with a drop or two of metallic mercury, and letting it sit for a while before exposure. This was at a time when "normal" speed film was ASA 25, or maybe 50, and "fast" film was all of ASA 160!
I should try it the next time I break a mercury thermometer....
NExt in the alternative process forum - Tunadol and sashimetol developer.
Think wasabi can be used for toning?
...
I have some Ika Zumi "squid ink"... any ideas on how to use that?
Ray
Faux selenium?
The squid's already dead - might as well eat it.
Humm,
using that logic one might consider eating dead relativesas well....
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